or T.S.

tool shed.
top secret.
Also t.s. Slang: Vulgar. tough shit.
Informal. transsexual.

T, t


noun, plural T's or Ts, t's or ts.

the 20th letter of the English alphabet, a consonant.
any spoken sound represented by the letter T or t, as in tub, but, or butter.
something having the shape of a T.
a written or printed representation of the letter T or t.
a device, as a printer's type, for reproducing the letter T or t.


    to a T, exactly; perfectly: That job would suit you to a T.Also to a tee.



noun (sometimes lowercase)

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for ts



noun plural t's, T's or Ts

the 20th letter and 16th consonant of the modern English alphabet
a speech sound represented by this letter, usually a voiceless alveolar stop, as in tame
  1. something shaped like a T
  2. (in combination)a T-junction
to a T in every detail; perfectlythe work suited her to a T


symbol for

troy (weight)
statistics distribution
statistics See Student's t


symbol for

absolute temperature
chem tritium
biochem thymine
surface tension

abbreviation for

Thailand (international car registration)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ts


to cross one's T's (and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly" is recorded from 1690s, though the exact signification is uncertain, despite much speculation. The measuring tool called a T-square is recorded by that name from 1785.

Online Etymology Dictionary, © 2010 Douglas Harper

ts in Medicine



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ts in Science


Abbreviation of temperature, tesla, thymine
The symbol for the isotope tritium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with ts


see dot the i's and cross the t's; to a T.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.